This type of obstetrical forceps, with a screw in the handle, was introduced by George Thomson Elliot (1827-1871), a New York obstetrician.
Ref: George T. Elliott, “Description of a New Midwifery Forceps, Having a Sliding Pivot to prevent Compression of the Foetal Head,” New York Journal of Medicine 5 (1853): 160-163.
George Tiemann & Co., Armamentarium Chirurgicum (New York, 1879), p. 104.
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